Lifting-jack



A. A STROM. LFT'ING JACK.

I Patented Dem 8, 1885.

Miren STATES PATENT @ritroso AXEL A. STROM, OF AUSTIN, LLINGS.

l.:Fritieni/iciol SPECIFICATION forming part of Letters Patent No. 331,919, dated December 8, 1885.

Application filed October 27, 18H5. Serial No. 181,088. (No model.)

To all whom it may concern'.-

Beit known that l, AXEL A. Srnoir, a citi` zen of the United States, residing at Austin, in the county of Cook and State of Illinois, have invented certain new and useful lmprovements in Lifting-Jacks, and I hereby declare the following to he a full, clear, and exact description of the same.

My improvement relates to the class of lift ing-jacks in which a bar located within a standard is raised vertically by means of a suitable clutch device operated by a lever; and it relates particularly to a device of the foregoing description adapted especially to the lifting and sustaining in the lifted position of very heavy bodies, such as railroadcars.

It is my object to provide such a contrivance that will involve a construction of great simplicity, and which shall serve to raise bodies of great weight and sustain them in their raised positions without any possibility of unintentional slipping with the strain.

To this end my invention consists in the construction, which involves, broadly, a bar recessed transversely to receive rollers within the recesses to `raise the bar and hold it in raised position, a clutch-block surrounding the bar and recessed to contain the liftingroller and means for actuating the clutch.

Myinvention also consists in means operating with the foregoing mechanism to permitthe bar to be lowered,` and it further consists in certain details of construction and combinations of parts, all as hereinafter more fully set forth.

Referring to the drawings, Figure l is a front elevation of my improved lifting-jack; Fig. 2, a vertical central section through the same, presenting a side elevation; Fig. 3, a side elevation of the same with the end ofthe lever broken away; Fig. 4, a plan view taken on the line a et of Fig. 3; and Fig. 5, a plan view taken on the line 5 5 of Fig. 2, showing part of the bar-releasing mechanism.

Ais a hollow standard, cast, preferably, in one piece and of the form shown,with a vertical slot, r, in its front side to permit the play of the foot of the lifting-bar,and an enlarged slot or chamber, i", toward its upper end to contain the clutch device and part of the bar-releasing mechanism and permit the necessary play of the clutch block, all as hereinafter described.

B is a lifting-bar, preferably quadrilateral in form, as shown, within the standard A, provided with the foot B', and recessed transversely along its rear side by providing semicircular grooves q, one above the other,along the same, preferably equidistant apart.

C is a clutch, comprising, preferably, a square block, as shown, surrounding the lifting-bar within the chamber l, and supported on journals p, which extend through and beyond the web of the standard. The square opening through the clutch-block C is enlarged toward its rear side to afford a chamber, o, sufficiently capacious to accommodate a portion of the releasing mechanism, hereinafter described, and beveled on its lower side to slant toward the liftingbar, and the standard itself is enlarged internally to afford a chamber, o, in forni like the chamber o, and directly below the latter. Each chamber o and o contains a roller, D, which rollers, owing to the slanting bottoms of the chambers, continually lie, when the jack is in operative position, against the bar B, and enter the grooves or recesses y, when the latter are coincident with them.

E is the lever, which comprises a hollow socket, a, to receive an extension, and bifun cated toward its opposite end to afford arms m, which embrace the sides of vt-he standard, and are journaled toward their extremities to the journals p of the clutch-block. Toward their rear extremities the arms m are fulcrumed upon journals p', which extend through them and project from opposite extremities of a bar or box, F, which plays in an enlarged recess, Z, formed in a rear extension, G, ofthe web of the standard.

To aotuate the device to lift, the lever E is forced downward, whereby the clutch-block G is caused to rise, and, owing to the abutment of the roller D within the chamber o against the bottom ofthe same, and its consequent pressure, prod uced by raising the clutchblocl; against the lifting-bar and within a recess q, formed in the same, the bar B will he IOO raised, and in rising the roller D in the chamber o' will be expelled from a recess or socket q and maintained out of such recesses until the operation upon the lever E shall cease, when it will roll into a socket q, presented to admit 1t and maintain the bar B in its raised K position, ready to be further lifted by raising the handle of the lever and lowering the clutchbloclr C and roller G' for another grip.

To lower the lifting-bar for the purpose of letting down the object raised by it, I' provide mechanism operated by hand to accomplish the desired result in a gradual manner, preferably to the extent of one recess g at a time, of which the following is a description.

Each roller D has journaled to it toward its extremities the arms lc of a bifurcated rod, H, hook-shaped toward its outward extremity,as shown, and extending each from the respective recess o and o in which it operates, backward through the web of the standard. By pulling upon the rod Hin the recessothe roller D therein will be withdrawn from the transverse socket q, containing it, and the weight of the lever E, assisted by pressure, if necessary, willoperate to raise the clutch-block C, and the said roller D (the rod H being released) will roll into the next higher recess q, thus bringing the lever Eto or near ahorizoutal position. At the end of this operation, however, the bar B is still firmly held by the roller D in the recess o. By forcing to a slight extent downward upon the lever E the lifting-bar will be raised sufliciently to permit the Withdrawal by hand, through the medium of the rod H, of the roller D within the recess o from the notch or socket q which contains it, and with the release of the lever E and the said rod H the lifting-bar will fall to the extent of one notch q, being stopped by the said roller D,

which will roll into the next higher notch or groove q.

Obviously by maintaining both rollers D out of contact with the transverse grooves q, when once withdrawn from the same, the lifting-rod may fall suddenly through the distance to which it is raised from its normal position.

Vhat I claim as new, and desire to secure by Letters Patent, is

l. A lifting-jack having its bar recessed transversely, rollers to enter the recesses to raise the bar and hold it when raised, aclutchbloclr upon the bar and recessed to contain the lifting-roller, and means, substantially as described, for actuating the clutch, substantially as set forth.

2. A lifting-jack having its bar recessed transversely, rollers to enter the recesses to raise the bar and hold it when raised, a clutchblock upon the bar and recessed to containv the lifting-roller, means, substantially as described, for actuating the clutch, and means, substantially as described, for releasing the bar to permit its descent when raised, substantially as set forth.

3. A lifting-jack having its bar recessed transversely, a clutch-block surrounding the bar and provided with a recess, o, on a side adjacent to the recess in the bar, and having a slanting bottom, a loose roller within the recess 0, a loose roller adjacent to the recesses in the bar and within a recess, o', in form like the recess 0, and provided in the standard portion of the device below the recess o, and means, substantially as described, for actuating the y clutch, substantially as set forth.

4:. A lifting -jaclr having its bar recessed j transversely, a clutch-block surrounding the bar and provided with a recess, o, on a side adjacent to the recesses in the bar, and provided with a slanting bottom, a loose roller within the recess o, a loose roller adjacent to the recesses in the bar and within a recess, o', in form like the recess o, and provided in the standard portion ot' the device below the recess o, means, substantially as described, for actuating the clutch, and means, substantially as described, for releasing the bar to permit its descent when raised, substantially as set forth.

5. A lifting-jack having its bar recessed transversely, a clutch-block surrounding the bar and provided with a recess, o, on a side adjacent to the recesses in the bar, a loose roller within the recess 0,-a bifurcated lever, E, having its arms journaled to opposite sides of the clutch-block, and fulcruined upon a shifting block, F, supported in the standard, a loose roller within a recess, o', in form like the recess o, and provided in the standard portion of the device below the recess 0, and means, substantially as described, for releasing the bar to permit its descent when raised, substantially as set forth.

6. A lifting-jack having its bar recessed transversely, a clutch-block surrounding the bar, and provided with a recess, o, on a side adjacent to the recesses in the bar, a roller, D, within the recess o, a bifurcated rod, H, having its arms journaled upon thesaid roller D toward the ends of the same, and extending beyond the standard portion of the device, a roller, D, within a recess, o, formed in the standard portion of the device below the recess o,a bifurcated rod, H, having its arms journaled upon the said roller D toward the ends of the same, and extending beyond the standard portion, and means, substantially as described, for actuating the clutch, substantially as set forth.

7. A lifting-jack having its bar recessed tranversely, a clutch-block surrounding the bar and provided with a recess, o, on a side adjacent to the recesses in the bar,a roller, D, within the recess o, a bifurcated rod, H, having its arms journaled upon the said rollerl D toward the ends of the same, and extending beyond the standard portion of the device, a bifurcated lever, E, having its arms journaled at opposite sides of the clutchblock, and fulcrumed upon a shifting block,

IOS

IIO

IZO

F, supported in the standard, a roller, D, ing constructed and arranged to operate subwithin a recess, o', formed in the standard stanbially as described. portion of the device below the recess o, and a bifurcated rod, H, having its arms 5 joui-naled upon t-he said roller D toward the In presence ofends of the same, and extending beyond the MASON BROSS, standard portion of the device, the whole be- WM. SADLER.

AXEL A. STROM. 

